Magic angle twisted graphene hosts low energy flat band as a result of interlayer hybridization. In the flat band Coulomb interaction is large relative to the bandwidth, promoting a collection of correlated insulating (CI) states at commensurate partial band filling, superconducting (SC) phases with dome-like structure, ferromagnetism and even…

The DAMIC (Dark Matter in CCDs) experiment uses silicon charge-coupled devices (CCDs), traditionally employed for imaging purposes, to detect potential ionization signals from dark matter interactions. These approx. mm thick devices feature an impressively low leakage current (< 10-21 A/cm2) and a very low energy threshold (40 eVee), making…

Macromolecular protein complexes perform essential biological functions across life forms. The assembly of such complexes is known to be regulated at the level of gene transcription, but little is known about the factors that control their assembly once the mature protein subunits enter their target space (cytoplasm, membrane, or cell wall)…

I will discuss topological classification of gapped many-body Hamiltonians and their ground states in dimension d. In general, the problem is too hard as it includes diverse phenomena such as degenerate ground states on the torus, anyons, and fractons. There is, however, hope to fully understand short-range entangled, or "invertible" systems,…

Abstract:

Polarization anisotropies on the cosmic microwave background (CMB) is an interesting target for astroparticle physics. Especially, the parity-odd component, the so-called B-mode, in degree scale is a unique probe of primordial gravitational waves from the cosmic inflation. The POLARBEAR experiment is a ground-based CMB…

The immune system is composed of a large number of heterogenous interacting components that collectively recognize and clear pathogens. To cover the high-dimensional molecular space of all possible threats, including those that have never been seen before, the adaptive immune system is endowed with a wide variety of receptor proteins, which are…

Dark matter is one of the greatest puzzles facing physics today. Our attempts to find a dark matter particle have so far come up empty-handed, and the theoretical models that have guided these efforts for the last 30 years are increasingly suspect. We still have few clues as to its nature. In this talk, I will explore two new and complementary…

We will prove a conjecture [1] on upper bound of asymptotic gap in dimension in unitary compact 2D CFT, proving it to be 1 using a "extremal" function [2]. The notion of asymptotic gap can be generalized to (h, \bar{h}) plane [3]. We will discuss how the extremal function used in [2] can be put into a bigger (natural) framework of an extremal…

The Andromeda galaxy is the closest spiral galaxy to us. It harbors a massive dark matter halo which may span up to ∼600 kpc across and comprises ∼90% of the galaxy’s total mass. This halo size translates into a large diameter of 42 degrees on the sky for an M31–Milky Way distance of 785 kpc, but its presumably low surface brightness makes it…

Atoms and molecules in the ultracold regime have emerged as promising platforms for quantum simulation of strongly-correlated matter. In this talk, I will describe recent progress on two fronts to study quantum many-body physics with ultracold gases. First, using ultracold fermionic atoms…

Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. In this talk, I will present the latest results from EXO-200, which searched for neutrinoless double beta decay (0υββ) in Xe-136 between 2011 and 2018. I will also present a measurement of the absolute scintillation and ionization response…

The Cosmic Microwave Background is a unique tool to investigate the early universe and the largest structures observable in the sky. The main CMB observables such as anisotropies, polarization state and Sunyaev Zel’Dovich effect can give us a detailed view of the cosmos providing stringent constraints to the parameters of our models. To extract…

Every astrophysically realistic simulation needs accurate initial data and in this talk I will present methods to obtain such solutions for a variety of problems. In particular I will focus on a new initial data formulation to solve the full set of Einstein equations for spacetimes that contain a black hole under general conditions. As an…

Organisms are an evolutionary masterpiece of feedback control, featuring a mind-boggling capacity to self-correct. In this talk, we discuss our attempts to both understand feedback control in cells and to forward engineer it with de novo designed proteins.

Searches for inflationary gravitational wave signals in the CMB B-mode polarization are expected to reach unprecedented power over the next decade. A major difficulty in these ongoing searches is that Galactic foregrounds such as dust can easily mimic inflationary signals. Though typically foregrounds are separated from primordial signals using…

The National Academy has recently called for the US to adopt a strategy to produce fusion electricity from a compact pilot plant by mid-century. This approach requires innovations in technology (e.g. magnet systems and power handling systems) and innovations in physics. I will introduce the key issues that challenge the current program and…

A remarkable recent development is the discovery of correlated electronic states in twisted bilayer graphene and other moire graphene systems. In this talk I will discuss aspects of the theory of these systems. I will show that both strong correlations and band topology are features of many graphene moire lattices. I will…

Very light axions are a generic prediction of string compactifications. If cosmic strings associated with these axions were produced in the early universe, they quickly approach a so-called scaling solution, such that strings persist in the sky today. I will present some remarkable signals of such strings coupled…

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